What is the weather like in Denver vs Yellowstone National Park in September?

In September, Denver averages 29°C high / 11°C low with about 24 mm of rain; Yellowstone National Park averages 17°C high / 1°C low with about 59 mm.

Denver vs Yellowstone National Park in September

Denver is the better pick in September — 90 vs 84 on SeasonMap's comfort score. Denver is warm, dry, clean air, while Yellowstone National Park is cool, a little rain, clean air.

Denver vs Yellowstone National Park — September climate, side by side

	🇺🇸 Denver	🇺🇸 Yellowstone National Park
Comfort score	90/100 (S)	84/100 (A)
Feels-like high	27°C	14°C
Avg high / low	29° / 11°	17° / 1°
Rainfall	24 mm	59 mm
Rainy days	3	11
Humidity	46%	59%
Air quality (AQI)	38	43

Monthly climate normals (ERA5 reanalysis). Comfort scores are SeasonMap estimates.

Month by month

Denver vs Yellowstone National Park in September — FAQ

Is September better in Denver or Yellowstone National Park?: Denver is the better pick in September — 90 vs 84 on SeasonMap's comfort score. Denver is warm, dry, clean air, while Yellowstone National Park is cool, a little rain, clean air.
What is the weather like in Denver vs Yellowstone National Park in September?: In September, Denver averages 29°C high / 11°C low with about 24 mm of rain; Yellowstone National Park averages 17°C high / 1°C low with about 59 mm.